A long time ago, I had a Citroen ax gt.
It was about 2am and was leaving a large car park in Durham with my girlfriend at the time.
As I was coming out a white Astra with 2 burly blokes in it shot up behind me flashing the lights (not blue) and trying to make me pull over.
I panicked and booted it.
Left the Astra, but in the process needed to be hitting some silly speeds coming out of the city to escape.
A couple of minutes later a senator county car homed in on me and fired up the blues and twos and pulled me.
On stopping and getting out I explained my situation to the traffic cop, he could tell I was shaken up a bit.
Then right on cue the Astra pulled up with 2 unmarked police in it.
The traffic officer went to town on the pair of unmarked officers, shouting and ranting at the pair and sent me on my way. Lol
So yeah, don't ever pull over unless it's obvious that it's the police.
AX GT? Blimey, they take me back a bit. Nearly bought a second hand one of them. Was a toss up between that, a 106 XSI, and a brand new Fiesta Si. Unfortunately I bough the Ford. Nothing wrong with it, but my mate then bought the 106, which was in every way the better car.
But in my Fiesta, I had a similar situation as you. Driving home from Tall Trees at 3am. Dark Blue Nova came right up behind me. Looked like it had wonky headlights, as the beam seamed brighter than normal and pointed upwards. Pretty much blinded me in my mirrors. Going round a corner I could see it was at least 2 up, with the driver being quite large.
I kept turning off, and they kept following. Then you start thinking the worst. So thought F*** it. If you want it, you'll have to catch me. Floored it on some back roads, but then (to get home) I had to go through the outskirts of a town (40 & 60 zones) where I didn't slow down. They were doing well to keep up I thought.
But as I got nearer home, you then start to think what to do. Got to my village and pretty much hand braked it onto my driveway. Jumped out and started to run to my front door. It was only then they identified themselves as police.
Started having a go at me regarding my driving. Wasn't having any of that, as they could have stopped me straight away by hitting the lights and siren. Wasn't shouting at them, but certainly making my feelings known that they'd pushed me into speeding off and driving the way I was. Following too close. Light blinding me, and being the hour it was, and told them I feared for my safety. They could have thrown the book at me I suppose, but somehow I got let off with a "Don't drive like that again".
Still, it's not every day you get to be chased by an unmarked police car and get away with it. Not something I'd want to do again mind.